I didn't mention it happening ACTs and that's why you could not find it there. I said it could be found in Galatians chapter 2. The disciples both in the time with Christ and afterward had their own struggles and disagreements. Their knowledge was not immediate it was life long obtained for the most part like the rest of us. Granted GOD did before the cross reveal to Peter some things as Christ mentioned and some was given them in the first chapters of The Acts. But it was a life long process as we see in The Revelation of Jesus Christ shown to John sometime close to his death. At times throughout their lives they had their own all too human problems including jealousy in their earlier times. The jealousy seem too prevail during their time Christ was on earth with them.
But here is what many are missing. Their difference in certain things they did or did not believe or their attitude toward another at times {Paul-Barnabas} lead to the ones separating for a time and preaching the Gospel to more people as a result. The personal rift between Paul and Barnabas over John Mark was later resolved. But in the mean time Paul and Silas as well as Barnabas and John Mark reached many people as a result.
"Get thee behind me, Satan!"